Preparation, anti-biofouling and drag-reduction properties of a biomimetic shark skin surface

Pu, Ximing; Li, Guangji; Hanlu, Huang

doi:10.1242/bio.016899

Cited by 96 publications

(73 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of the movement of the appendage on four-legged animals in a slope also requires comprehensive understanding. In this study, the trajectory of the head centroid movement of a goat on a slope is measured and its influence on the stability is analyzed to solve the problem of irregular ground walking of current small machinery [21][22][23][24][25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

Development of agricultural bionic four-legged robot: Effect of head movement adjustment on the stability of goats

Zhang

Chen

Li-min

et al. 2019

International Journal of Agricultural and Biological Engineering

View full text Add to dashboard Cite

The four-legged bionic robot for agriculture has been one of the hotspots in the field of robotics. The farmland environment is complex, and the balance requirement of quadruped bionic robot is higher. However, head adjustment is a key factor affecting the balance of quadruped animals. Based on this, this study takes the four-legged animal goat as an example to investigate the effect of goat head movement adjustment on the balance of goat. In this study, the head and neck of goats were simplified to a two-link model. The kinematics model was established by D-H method. MATLAB software was used to solve it. Origin software was used to draw the movement track of the center of mass of the head. The center of mass movement of the head is a quarter ellipse. Then, the goat walking experiments were carried out on the different slopes (0°, 5°, 10°, 15°, 20°, 25°, 30°, 35° and 40°). MATLAB software was used to fit the movement data of goat head. The movement of the center of mass of the goat's head corresponds to Fourier 6. The result is: the determination coefficient is 0.8629, and the mean variance is 0.019. When the slope gradient gradually increases, the volatility gradually increases and is cyclical. The results of this study verify the rationality of the four-legged bionic mechanism under various parameters and reveal the mechanism of goat walking with an appendage at the head.

show abstract

Section: Introductionmentioning

confidence: 99%

Development of agricultural bionic four-legged robot: Effect of head movement adjustment on the stability of goats

Zhang

Chen

Li-min

et al. 2019

International Journal of Agricultural and Biological Engineering

View full text Add to dashboard Cite

show abstract

“…Therefore, these methods are always time‐consuming, expensive, and size‐limited. Some other methods, including surface wrinkling, self‐masking reactive‐ion etching, nano‐imprinting lithography, and relevant biomimetic fabrication methods cannot control the period and height of the surface micro‐grooves precisely. Because of the lack of suitable fabrication methods, systematic studies about the influences of anisotropic groove‐like microstructures on the anisotropic sliding behavior are insufficient.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Sliding of Water Droplets on the Superhydrophobic Surfaces with Anisotropic Groove‐Like Micro/Nano Structures

Long

Fan

Jiang

et al. 2016

Adv Materials Inter

View full text Add to dashboard Cite

droplets to move along the leaf veins and finally to the root, helping the plants to survive. [11] Inspired by rice leaves, several methods have been proposed to fabricate anisotropic groove-like micro-and nanostructures for obtaining superhydrophobic surfaces with anisotropic sliding behavior. [14][15][16][17][18] Comparing to normal microstructures, fabricating such microstructures faces some challenges. The formation of anisotropic groove-like micron-structures with large period and height is really difficult. So most methods use photolithography to prepare micro-grooves, and combine with other methods to form nanostructures. [11,13,[19][20][21] Therefore, these methods are always timeconsuming, expensive, and size-limited. Some other methods, including surface wrinkling, [22,23] self-masking reactive-ion etching, [24] nano-imprinting lithography, [25] and relevant biomimetic fabrication methods [26,27] cannot control the period and height of the surface micro-grooves precisely. Because of the lack of suitable fabrication methods, systematic studies about the influences of anisotropic groove-like microstructures on the anisotropic sliding behavior are insufficient.In this work, we found that the groove-like microstructures and anisotropic sliding behavior of water droplets were also existed on some other plants, such as the reed leaves. To understand more about the anisotropic sliding behavior of water droplets caused by the anisotropic groove-like microstructures, we fabricated periodic groove-like microstructures on metal surfaces by femtosecond laser micromachining. As the flexibility and controllability of this method, we could not only control the period and height of the surface micron-structures, but also regulate the surface nanoscale roughness. We studied the influences of these structural parameters on the anisotropic sliding behavior systematically, and theoretical analyses were conducted to explain the observed phenomena. Results and Discussion Reed LeavesThe surfaces of rice leaves display many parallel micro-grooves. The width and depth of these micro-grooves reach up to about Former studies have found that water droplets on the rice leaves exhibit anisotropic sliding behavior, which is mainly caused by the anisotropic groovelike surface microstructures. Similar groove-like surface microstructures and anisotropic sliding behavior of water droplets can also be found on some other plants, such as the reed leaves. In this paper, biomimetic groove-like surface microstructures are fabricated on copper surfaces by femtosecond laser micromachining. Thanks to the flexibility of this method, the period and height of the periodic micro-grooves can be precisely controlled, and the nanoscale surface roughness can also be regulated. The influences of these surface morphologies on the wetting state and anisotropic sliding behavior of water droplets are studied systematically, and theoretic analyses are also conducted. Our results prove that the anisotropic sliding behavior is mainly decided by the wetting stat...

show abstract

“…The grain boundary etched SS316L displayed hydrophobicity and microscale structure, which can prevent bio-fouling, thereby further reducing the probability of localized corrosion initiation in a maritime environment. [21][22][23]26,31,32 Preliminary investigations have indeed shown that the surface topography on SS316L achieved by potentiostatic polarization can significantly reduce the adhesion of bacteria compared to the surfaces of as-received and electro-polished SS316L. An in-depth study of the correlation between SS316L surface topography and biofouling is currently underway, but discussion of these results is outside the scope of the current paper.…”

Section: Resultsmentioning

confidence: 92%

Hydrophobicity and Improved Localized Corrosion Resistance of Grain Boundary Etched Stainless Steel in Chloride-Containing Environment

Choi¹,

Oh²,

Singh³

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

Localized corrosion of stainless steels by chloride ions in seawater leads to metal degradation while fouling of marine organisms increases the occurrence of localized corrosion. We describe a simple method to increase hydrophobicity of austenitic stainless steel using grain boundary etching that can also inhibit adhesion of bio-organisms present in seawater as well as increase the localized corrosion resistance of stainless steel in chloride-containing aqueous environments. This paper describes the corrosion behavior of stainless steel as a result of grain boundary etching to achieve hydrophobicity. Potentiostatic polarization on stainless steel 316L in a nitric acid solution at an anodic potential of 1.3 V vs. saturated calomel electrode (SCE) results in a grain boundary etched structure and a Cr-and Mo-rich passive film as confirmed by scanning electron microscopy and X-ray photoelectron spectroscopy. This modified stainless steel 316L surface exhibits enhanced corrosion resistance to a 0.6 M sodium chloride solution. Specifically, potentiodynamic polarization studies indicate that the breakdown potential increases and the sample-to-sample variability decreases. Due to the ubiquitous use of metals in infrastructure, production and manufacturing, transportation, and utilities, corrosion results in compromised safety and recurring repair costs.1 One of the most commonly employed approaches to control corrosion is the use of corrosion resistant alloys.1 Stainless steels (SSs), which are defined as steel alloys containing at least 10.5% chromium content by mass, are the most frequently used materials in aqueous environments because of their enhanced corrosion resistance relative to carbon steels. 2Chromium participates in the formation of a stable passive film on SSs that protects the bulk metal against corrosion.3 However, SSs still suffer from localized corrosion when exposed to chloride-containing aqueous environments, including seawater 4,5 and bleach plants associated with pulp and paper industries. Strategies to improve the localized corrosion resistance of SSs include enrichment of Cr and Mo at the SS surfaces and removal of surface inhomogeneities.7 These SS surface treatments include mechanical polishing, 8,9 passivation, 7,9-11 and electro-polishing. 8,[12][13][14] Mechanical polishing results in Cr-rich SS surfaces. 9 Surface passivation of SS using a nitric acid solution removes surface inhomogeneities and enhances the formation of a Cr-rich passive film. Electro-polishing is a technique to control the surface finish of a metal by anodic electrochemical dissolution to yield a smooth metal surface. Electro-polishing removes surface inhomogeneities from the SS surface and simultaneously forms Cr-and Mo-rich passive films. Electropolished SS surfaces show higher localized corrosion resistance than mechanically polished and passivated SS surfaces.14 Chromium oxide/hydroxide (Cr 2 O 3 /Cr(OH) 3 ) in the passive film hinders movement of cations into the electrolyte and thereby delays local breakdown of the ...

show abstract

Preparation, anti-biofouling and drag-reduction properties of a biomimetic shark skin surface

Cited by 96 publications

References 26 publications

Development of agricultural bionic four-legged robot: Effect of head movement adjustment on the stability of goats

Development of agricultural bionic four-legged robot: Effect of head movement adjustment on the stability of goats

Anisotropic Sliding of Water Droplets on the Superhydrophobic Surfaces with Anisotropic Groove‐Like Micro/Nano Structures

Hydrophobicity and Improved Localized Corrosion Resistance of Grain Boundary Etched Stainless Steel in Chloride-Containing Environment

Contact Info

Product

Resources

About